Dynamo-electric machine.



R E. HELLMUND. DYNAMO ELECTRIC MACHINE. APPLICATION FILED MAR. 23, 1914.

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UNITED STATES PATENT OFFICE BUDOLF E. HELLMUND, 0E PITTSBURGH, PENNSYLVAINTL ASSIG-EGB INGHDUSE ELECTRIC AND MANUFACTURING CGM'PANY, A GORPQM'EZOH OE ZPENNSYLVANIA.

DYHAMO-ELECTBIG MACHINE.

Elpecificetion of Letters Patent.

Patented Apr. 2 lgiilo Application filed March 23, 1914. Serial Ho. $526,55

To all whom it may cove me:

Be it known that l, RUBOLF E. HELL- MUND, a subject of the German Empire, end. a. resident of Pittsburgh, in the county of Allegheny and State or Pennsylvania, lieve invented a new and useiul Improvement in Dynamo-Electric Machines, of which the following is e specification.

My invention relates to machines, and. it alternating current motors of the commutetor type and to other machines of this general class The object of my i ventiorr is to provide so simple enri inexpensive means for obviatin the vibration of the core teeth in me, chmes of the alcove-indicated type WliSilfllllS sacrificing their electrioel performances.

In dynamo-electric machines of the above indieeteel character, it is rlesirelale from mechanical stone-point, particularly the field structures, to peripherally close the coil slots of such structures to prevent vibration dynamo-electric of the laminated polar projections or teeth anti consequent deterioration of the mg materiel. On the other hemi it is desirsble electrically to have the slots open to reiuce l18 magnetic leelrage In orzler to secure to the n1eel1iees,in so for as may be possible, the edventegesoi both types oi field struetureyl provide a megnetizable core having a plurality of coil openings and ha a megnetizeble material peripherally locate with respect to certain of said openings in such manner as to sol stzmtially-prevent locel vibration of the laminetions and to simultaneously allow a relatively small amount of magnet c leakage across the openings.

In the accom anying drawing, Figure 1 iso view, in ovation, of e portion of a magnetizable core of a. dynamo eleotric machine constructed in acoordaince with my invention; Fig". 2 1nd 3 are detail views of the two different types of laminations embodied in the core shown in Fig. 1; Figs; 4, 5 and 7 are views, in elevation, of modifications of my invention; and Figs. 6 and 8 are deteil views of the types of laminations embodied in the structures illnstratecl in Figs. 4 and 5 and Fig. 7 respectively.

Referring to the drawing. the magnetizable structure shown in Fig. It comprises a,

plurality of side-by-side sets oi lami rietions has special reference to registering,

slots 10, is shown. The lazuli-rations 8 are l of the type illustrated in Fig 2 and e plurality of leminetions 2 disposed between the sets of lemineticns 1 end of tlietype iiicliceted in Fig. 3. Each lamination l is provided with e plurality of peripheral coil slots 3 of e customary type eecli lamination 2 is provider Wllfil plurality of spaced coil openings or eper-tires 4-; thereby providing en unbroken periphery in the lemmetioris shown in Fig; 3, whereas the periphery of the leminetiore ill 5 Fig 2 is et'pre' determined intervals. Lo all m i ftlie main portion of e core is preferebiy formed from members iii risuel, promembers 2 are inserted r e in elinemerit with seicl ti o firm mechanics-.1 uniori or l slot While still permitting the i winrlirigg conductors, i s 23 tion or the core teet to the insule'tiori is 5 sometime, the the machine are subste Reference may now he lied to Figs l; encl 5, wherein all the lem iietioiis 5 of the type illustretee in 6. Each lamination is provided with alternately disposed peripheral coil slots e eml eoil apertures '6". Tiles, the periphery of cash le-minetioii is may} netically interrupted at every elteriiete coil opening, as shown in the drawing, out it will be understood that every third or fourth. coil opening may be oi the peripherally slotted type, if desirecl,

In Fig. 4, the laminations are shown as assembled with their coil slots ,6 nflotuelly thus providing elternetely (lisposed 0 en and closed slots. In Fig. 5, the laminstlons 5 are disposer} in the me etioable structure in suchmanner that t e coil slots 6 are laterally located with respect to each other. Thus, each of the slots 6 re ister with a difierent aperture 7, as indicated in Fi 5. ,In Fig. 7, a structure composed of a p urolity of laminations 8, one of which is partially illustrated in Fig. 8 as having a plurality of sets of spaced coil apertures 9 and a plurality ofintermeeliete sets of coil preferably assembled to have the corre sponding slots mutually register, thereby forming a core structure having a.

ill

:bination with a slotted spaced bridges integral therewith and comof sets of peripheral slots and a intermediate unbroken areas. 1 It Wlll be understood, without further exposition, that all the core structures illustrated are adapted to accomplish the desired object of mechanically connecting the core teeth of the magnetizable structure and thus substantially preventing vibration thereof,without causing too great a proportion of magnetic leakage between the teeth.

I do not d'esire to be restricted to the specific structural details herein set forth, but desire that only such limitations shall be imposed as are indicated in the appended claims.

I claim as my invention:

1. A magnetizable core for a dynamoelectric machine having coil-receiving slots and comprising laminations some of which have peripherally open slots and some of which have slots that are peripherally closed by unitary bridging members integral with the laminations on each side of the respective slots to" substantially prevent local 1 vibration of the laminations and allow a relatively small amount of across the slots.

. 2. A dynamo-electric machine core having a plurality of coil-receiving slots and comprising laminations of magnetizable material, some of the slots in which have periphmagnetic leakage eral' openings and some are peripherallyclosed by continuous integral portions of the laminatlons spanning thereover to prevent local vibration of the laminations and allow a relatively small amount of magneticleakage across the openings.

3. In a dynamo-electric machine, the comcore structure, of

pletely spanning said slots.

In a dynamo-electric machine, the combination with a slotted core structure, of spaced bridges of magnetizable material integral therewith and completely spanning said slots.

5. ha dynamo-elmtric machine, the combination with a slotted core structure, of

plurality of na oapeo bridges spanning said slots at intervals and integral w1th said'core member at each abutment.

with both winding notches and winding per iterations. adjacent an edge thereof, swind- Ing notch in one of said laminations being disposed in line with a winding perforation in another, whereby winding slots are formed in said core member which are partially open and partially closed.

8. A core member for a dynamo-electric machine composed of laminations provided with both winding notches and winding perforations adjacent an edge thereof, a winding notch in one of said laminations being disposed in line with a winding perforation in another, whereby winding slots are formed in said coremember which are partially open and partially closed.

A magnetizable core for dynamo-electrio machines comprising a plurality of laminations severally having a plurality of spaced peripheral coil slots. and a plurality of sets of intermediate coil apertures, the

slots in contiguous laminations being rel RUDOLF E. HELLMUND.

Witnesses:

J. V. Donson, B. B. HINES.

6. A core member for a dynamo-electric with saidcore member core member for dynamo-electric 

